The horsepower at the rear wheels on my truck went from 199.5 at 2727 RPM to 271.3 at 2700 RPM for a gain of 71.8 horses. The torque went from 391.0 foot pounds at 2200 RPM to 565.8 foot pounds at 2000 RPM for a gain of 174.8 foot ponds. That's a 36% increase in horsepower and an astonishing 45% increase in torque! To make matters even better, the peak torque comes in at 200 RPM less than before. Performance upgrade details are here.